I've done some work progressing a tutorial on using Finale 2006 Human Playback with JABB - although most (if not all) principals should apply to GPO as well.
HERE [EDIT: this now links to the finished version]
Is this something worth pursuing do you think? - there's a lot of time and effort gone into it so far, and those are the two things are do not have an abundance of
Any feedback - good and bad - is appreciated.